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libceph: allocate ceph messages with a slab allocator 

Create a slab cache to manage ceph_msg structure allocation.

This is part of:
    http://tracker.ceph.com/issues/3926

Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: Josh Durgin <josh.durgin@inktank.com>
This commit is contained in:
Alex Elder 2013-05-01 12:43:04 -05:00
parent 78c2a44aae
commit e3d5d63804
1 changed files with 27 additions and 2 deletions
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29
net/ceph/messenger.c
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@ -152,6 +152,10 @@ static bool con_flag_test_and_set(struct ceph_connection *con,
return test_and_set_bit(con_flag, &con->flags);
}
/* Slab caches for frequently-allocated structures */
static struct kmem_cache *ceph_msg_cache;
/* static tag bytes (protocol control messages) */
static char tag_msg = CEPH_MSGR_TAG_MSG;
static char tag_ack = CEPH_MSGR_TAG_ACK;
@ -226,6 +230,22 @@ static void encode_my_addr(struct ceph_messenger *msgr)
*/
static struct workqueue_struct *ceph_msgr_wq;
static int ceph_msgr_slab_init(void)
{
BUG_ON(ceph_msg_cache);
ceph_msg_cache = kmem_cache_create("ceph_msg",
sizeof (struct ceph_msg),
__alignof__(struct ceph_msg), 0, NULL);
return ceph_msg_cache ? 0 : -ENOMEM;
}
static void ceph_msgr_slab_exit(void)
{
BUG_ON(!ceph_msg_cache);
kmem_cache_destroy(ceph_msg_cache);
ceph_msg_cache = NULL;
}
static void _ceph_msgr_exit(void)
{
if (ceph_msgr_wq) {
@ -233,6 +253,8 @@ static void _ceph_msgr_exit(void)
ceph_msgr_wq = NULL;
}
ceph_msgr_slab_exit();
BUG_ON(zero_page == NULL);
kunmap(zero_page);
page_cache_release(zero_page);
@ -245,6 +267,9 @@ int ceph_msgr_init(void)
zero_page = ZERO_PAGE(0);
page_cache_get(zero_page);
if (ceph_msgr_slab_init())
return -ENOMEM;
ceph_msgr_wq = alloc_workqueue("ceph-msgr", WQ_NON_REENTRANT, 0);
if (ceph_msgr_wq)
return 0;
@ -3068,7 +3093,7 @@ struct ceph_msg *ceph_msg_new(int type, int front_len, gfp_t flags,
{
struct ceph_msg *m;
m = kzalloc(sizeof(*m), flags);
m = kmem_cache_zalloc(ceph_msg_cache, flags);
if (m == NULL)
goto out;
@ -3215,7 +3240,7 @@ void ceph_msg_kfree(struct ceph_msg *m)
vfree(m->front.iov_base);
else
kfree(m->front.iov_base);
kfree(m);
kmem_cache_free(ceph_msg_cache, m);
}
/*